"There's a lot of other material on here that is really rich. There's a ballad called 'Perfume' that she recorded recently. Britney wrote it with Sia. It's a breakup song that's about wanting the next girl to smell your perfume on the guy afterwards.

"The lyric is really unique and she sings the s**t out of it. I think everyone will be really impressed by the song. I don't know if it will be the second or third single, but it will definitely be a single."

Rudolph continued: "There are a couple other songs that have a really modern EDM vibe and other stuff that has more of a Ray of Light (Madonna) vibe.

Britney Spears

"I really think of this as Britney's Ray of Light album - it's kind of like that in a lot of ways. She wrote everything on the album with collaborators. There's one or two she wrote herself.

"That's something she wanted to do coming in. She wanted to make it very personal. They're all custom-made for her, based on what's going on with her life and in her head."

Spears recently confirmed that her eighth studio album will be released on December 2 in the UK and a day later in the US.